Restaurant Week - visiting from the UK - I have time for one solo lunch

I'll be in New York on vacation, and July 11th will be my last day. For most of my stay I'll be hunting out good cheap eats, but I thought I'd take advantage of Restaurant Week to go somewhere special for my last lunch. I was wondering if anyone had any recommendations?

I'll be a solo casual/smart female diner, so I would prefer to avoid anywhere too formal or hushed, unless they have a reputation of being comfortable with solo diners (I myself am perfectly comfortable eating alone in formal restaurants, but have noticed on those occasions when I stick out like a sore thumb, that other diners seem to feel uncomfortable). So maybe somewhere with a counter, or with a buzzy atmosphere?

I'm allergic to shellfish so have to be careful with cuisines like Thai, that might have sauces with shrimp-like ingredients. But I like vibrant tastes so would prefer something that isn't too bland.

There are so many restaurants on the list that it would take me a long time to work through them and look at reviews, so I'd welcome any suggestions that might narrow down my search, I appreciate that might come across as lazy, but I haven't been to Manhattan for over ten years so I'm very grateful for help.